—She couldn't have done that sort of thing.

—Whatever she did was reasonable, _____ to what you did.Besides,it's none of your business.Get

down to _____ your lessons.[ ]

A. comparing; doing  

B. comparing; do

C. compared; doing  

D. compared; do

正常二尖瓣口面积为（）

A.1～2cm²

B.2～3cm²

C.3～5cm²

D.4～6cm²

E.6～8cm²